128422131 has 8 divisors (see below), whose sum is σ = 181301904. Its totient is φ = 80578560.

The previous prime is 128422103. The next prime is 128422139. The reversal of 128422131 is 131224821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128422131 - 2⁷ = 128422003 is a prime.

It is a super-2 number, since 2×128422131² = 32984487461162322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128422139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1258990 + ... + 1259091.

It is an arithmetic number, because the mean of its divisors is an integer number (22662738).

Almost surely, 2^128422131 is an apocalyptic number.

128422131 is a deficient number, since it is larger than the sum of its proper divisors (52879773).

128422131 is a wasteful number, since it uses less digits than its factorization.

128422131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518101.

The product of its digits is 768, while the sum is 24.

The square root of 128422131 is about 11332.3488739096. The cubic root of 128422131 is about 504.5218242676.

Adding to 128422131 its reverse (131224821), we get a palindrome (259646952).

The spelling of 128422131 in words is "one hundred twenty-eight million, four hundred twenty-two thousand, one hundred thirty-one".